Passive: Volibear temporarily gains bonus attack speed after an autoattack. This bonus stacks up to 3 times and lasts for 4 seconds.
Active: While Volibear has 3 stacks of Frenzy, he can activate this ability to bite a target enemy. The stacks wont be consumed. The bite will deal physical damage that scales with his own bonus health. This damage will in turn be increased by 1% for every 1% of the targets missing health.
Cost: 35 mana
Range: 400
Cooldown: 18 seconds
Passive Attack Speed: 8/11/14/17/20 % per stack
Max Attack Speed: 24/33/42/51/60 %
Base Physical Damage: 80/125/170/215/260 (+15% of bonus health)
Max Physical Damage: 160/250/340/430/520 (+30% of bonus health)

Active: For the next 12 seconds, Volibears autoattacks will blast his target with lightning that will also bounce to up to 3 nearby enemies. Each bolt of lightning will deal magic damage and will only hit each target once.
Cost: 100 mana
Bounce Range: 300
Cooldown: 100/90/80 seconds
Magic Damage Per Bolt: 75/115/155 (+0.3 per ability power)

Situational Items

Thornmail

+100 Armor
UNIQUE Passive: Upon being hit by a basic attack, reflects magic damage back to the attacker equal to 25% of your bonus Armor plus 15% of the incoming damage.
(Bonus Armor is Armor from Items, Buffs, Runes and Masteries.)
(Reflect damage is calculated based on damage taken before being reduced by Armor.)